Boiler-furnace



(No Model.)

J- COLLIS.

No. 811,874. Patented Peb. 1o, 1885.

@Y1/ig. 2

MV1/Tasses i UNITED STATES PATENT Orr-Ica..

JOHN coLLIs, on Das ivroiuns, Iowa..

BolLER-FURNACE.

SPECEICATION forming part of Letters Patent No. 311,874, dated February 10, 1885.

` pplicnon filed March 3, 1884. (No model.)

To all whom it may concern: Be it known that I, JOHN CoLLIs, of Des l lWIoines,in the county of Polk and State of Iowa, have invented an Improved Gas-Burner for Boiler-Furnaces, of which the following is a specification. My object is to prevent the waste of fuel, the fouling of flues, and all the losses'and annoyances occasioned by the production of smoke andsoot in a furnace.

Heretofore air conveying and distributing tubes have been attached to furnaces above and below grate-bars, to keep the grates cool, and to aid in producing' a draft and coinbustion Within the furnace.

My invention consists in the construction and combination of a double-walled furnacefront, a door having an air receiving and distributing chamber, an air-chamberin the wall at the rear end of the boiler, air-conveying tubes above and below the boiler, and superheating and distributing tubes or burners in the combustion-chamber, as hereinafterv fully set forth, in such a manner that cold air and oxygen will be drawn into the furnace from without and heated and distributed Within to promote perfect combustion of fuel, so that all the Valuable properties of the fuel will be utilized in generating heat, and all thatis usually' carried off in smoke and soot liberated and consumed within the furnace.

Figure l of my accompanying drawings is avertical and longitudinal section of afurnace, and a side view of a horizontal boiler,to which my invention is applied. Fig. 2 is aperspec- Jfive view of my double-walled hollow furnacei'ront.

.Tointly considered,these lign res clearly illustrate the construction, application, and operation of my complete invention.

A represents the masonry and solid wall at the front, B at the rear, and C at the side, of the furnace. i

D represents an arched wall under the boiler, and F a corresponding wall over the top of the boiler.

. G represents my double-walled hollo\vfront, that is preferably made of cast-iron.

H is a circular opening in its upper and central portion, through which access is gained to the front end of the boiler, and to which a door of corresponding shape is hinged.

L is an opening through which the chamber is accessible.

M is the lower portion ofthe smoke-fine, that starts upward at the front ofthe boiler. Tubes extending horizontally through the lower portion of the boiler connect the chamber K with y"the chimney or smoke flue vM.

N is a cold-air fine, formed in the rear wall,-

B, to extend upward from the upper portion of the end of the boiler.

P, shown in Fig. l, isa door in the opening I.

Ris an `open-ended chamber on the insidenof the door.

S are openings in the double wall, that coincide with the open ends ofthe chambers R when the doors are closed, and allow air to pass from i the hollow front G into the chambers R, and

from thence through perforations into the combustionchamber. v

R'z are chambers corresponding with the chambers R on the doors I), formed integral with or fixed to the inside of thc inner plate of the double wall, to project toward the combustion-chamber and to superheat and direct the air through their perforated backs into the fire upon the grate.

Ri" is a perforated section, that can. be used in place of the chambers R2, for distributing hot air from the hollow wall G.

Nos. l and 2 are open-ended tubes, xed to the inside of the hollow front G, below the circular opening H.

Nos. 3, 4, 5 represent a series of such tubes, fixed to the same hollow front around the upper portion of its circular opening.

T are perforated tubes, slipped over the fixed tubes No. 1, to extend into or through the combustionchamber, for the purpose of conveying, superheating, and distributing air within the combustionchamber and over the fuel and fire upon the grate, to promote combustion, and to prevent soot and smoke from escaping from the fire-chamber.

IOO

V are open-ended tubes, slipped over the fixed tubes No. 2', and extend rearward horizontally through the arched wall D, the chamber K, and the rear Wall, B,`to connect with the cold-air Hue or chamber N, for the purposes of conveying cold air and oxygen into the hollow front G, and heating it in its passage thereto.

W are air-conveying tubes, connected with the series of xed tubes 3 4 5, and extend through the arched Wall F to the flueN, to act in concert with the tubes V in filling the hollow front and air-reservoir G with air brought from the outside of the furnace and heated on.

its passage.

From the detailed description of the construction and function of each part of my improved furnace, it is obvious that when a fire is started upon the furnacegrate cold air and oxygen Will be drawn into the hollow front and air-reservoir G through the flue N- and tubes V and W, and heated to a certain degree on its passage, its degree of heat raised in the reservoir, and from thence distributed, through the perforated chambers R and .R2 yand the superheater and perforated tubes T, intothe combustion-chamber, to aid in `promoting the combustion of fuel and the burning and utilizing of all `the valuable properties ofthe fuel in making heat, steam, and power without producing smoke and soot.

I claim as my invention* 1. A double-walled front vand air-reservoir for furnaces, a boiler, a grate, and furnaceehamber, induction-tubes extending from the upper portion of the hollow front to the rear end of the boiler, for conveying and heating cold air, and superheating and distributing tubes extending into the fire-chamber from the lower portion of the same hollow front, arranged and combined to operate in the manner set forth, for the-purposes specified.

2. A rear furnace-wall, B, having chambers K and N and tubes V and W, in combination with a hollow front wall and air-reservoir, to operate in the manner set forth, for the prposes specified.

JOHN OOLLIS. Witnesses:

THoMAs G. ORWIG,

FRANK H. PERRY. 

